
/**
 * IosSelect
 * @param {number} level 选择的层级 1 2 3 4 5 6 最多支持6层 
 * @param {...Array} data [oneLevelData[, twoLevelData[, threeLevelData[, fourLevelData[, fiveLevelData[, sixLevelData]]]]]] 可以用数组，也可以用方法
 * @param {Object} options
 * @param {string=} options.container 组件插入到该元素下 可选
 * @param {Function} options.callback 选择完毕后的回调函数
 * @param {Function} options.fallback 选择取消后的回调函数
 * @param {Function} options.maskCallback 点击背景层关闭组件时触发的方法
 * @param {string=} options.title 选择框title
 * @param {number=} options.itemHeight 每一项的高度，默认 35
 * @param {number=} options.itemShowCount 组件展示的项数，默认 7，可选3,5,7,9，不过不是3,5,7,9则展示7项
 * @param {number=} options.headerHeight 组件标题栏高度 默认 44
 * @param {css=} options.cssUnit px或者rem 默认是px
 * @param {string=} options.addClassName 组件额外类名 用于自定义样式
 * @param {...Array=} options.relation 数组 [oneTwoRelation, twoThreeRelation, threeFourRelation, fourFiveRelation] 默认值：[0, 0, 0, 0, 0, 0]
 * @param {number=} options.relation.oneTwoRelation 第一列和第二列是否通过parentId关联
 * @param {number=} options.relation.twoThreeRelation 第二列和第三列是否通过parentId关联
 * @param {number=} options.relation.threeFourRelation 第三列和第四列是否通过parentId关联
 * @param {number=} options.relation.fourFiveRelation 第四列和第五列是否通过parentId关联
 * @param {number=} options.relation.fiveSixRelation 第五列和第六列是否通过parentId关联
 * @param {string=} options.oneLevelId 第一级选中id
 * @param {string=} options.twoLevelId 第二级选中id
 * @param {string=} options.threeLevelId 第三级选中id
 * @param {string=} options.fourLevelId 第四级选中id
 * @param {string=} options.fiveLevelId 第五级选中id
 * @param {string=} options.sixLevelId 第六级选中id
 * @param {boolean=} options.showLoading 如果你的数据是异步加载的，可以使用该参数设置为true，下拉菜单会有加载中的效果
 * @param {boolean=} options.showAnimate 是否需要入场动画和退场动画，如需自定义动画效果，请修改css
 */
(function() {
  /* modify by zhoushengmufc,based on iScroll v5.2.0 */
  var rAF = window.requestAnimationFrame  ||
      window.webkitRequestAnimationFrame  ||
      window.mozRequestAnimationFrame     ||
      window.oRequestAnimationFrame       ||
      window.msRequestAnimationFrame      ||
    function (callback) { window.setTimeout(callback, 1000 / 60); };
  var aF = (function () {
    var eleStyle = document.createElement('div').style;
    var verdors = ['a', 'webkitA', 'MozA', 'OA', 'msA'];
    var endEvents = ['animationend', 'webkitAnimationEnd', 'animationend', 'oAnimationEnd', 'MSAnimationEnd'];
    var animation;
    for (var i = 0, len = verdors.length; i < len; i++) {
      animation = verdors[i] + 'nimation';
      if (animation in eleStyle) {
        return endEvents[i];
      }
    }
    return 'animationend';
  }());

  var utils = (function () {
      var me = {};

      var _elementStyle = document.createElement('div').style;
      var _vendor = (function () {
          var vendors = ['t', 'webkitT', 'MozT', 'msT', 'OT'],
              transform,
              i = 0,
              l = vendors.length;

          for ( ; i < l; i++ ) {
              transform = vendors[i] + 'ransform';
              if ( transform in _elementStyle ) return vendors[i].substr(0, vendors[i].length-1);
          }

          return false;
      })();

      function _prefixStyle (style) {
          if ( _vendor === false ) return false;
          if ( _vendor === '' ) return style;
          return _vendor + style.charAt(0).toUpperCase() + style.substr(1);
      }

      me.getTime = Date.now || function getTime () { return new Date().getTime(); };

      me.extend = function (target, obj) {
          for ( var i in obj ) {
              target[i] = obj[i];
          }
      };

      me.addEvent = function (el, type, fn, capture) {
          el.addEventListener(type, fn, !!capture);
      };

      me.removeEvent = function (el, type, fn, capture) {
          el.removeEventListener(type, fn, !!capture);
      };

      me.prefixPointerEvent = function (pointerEvent) {
          return window.MSPointerEvent ?
              'MSPointer' + pointerEvent.charAt(7).toUpperCase() + pointerEvent.substr(8):
              pointerEvent;
      };

      me.momentum = function (current, start, time, lowerMargin, wrapperSize, deceleration) {
          var distance = current - start,
              speed = Math.abs(distance) / time,
              destination,
              duration;

          deceleration = deceleration === undefined ? 0.0006 : deceleration;

          destination = current + ( speed * speed ) / ( 2 * deceleration ) * ( distance < 0 ? -1 : 1 );
          duration = speed / deceleration;

          if ( destination < lowerMargin ) {
              destination = wrapperSize ? lowerMargin - ( wrapperSize / 2.5 * ( speed / 8 ) ) : lowerMargin;
              distance = Math.abs(destination - current);
              duration = distance / speed;
          } else if ( destination > 0 ) {
              destination = wrapperSize ? wrapperSize / 2.5 * ( speed / 8 ) : 0;
              distance = Math.abs(current) + destination;
              duration = distance / speed;
          }

          return {
              destination: Math.round(destination),
              duration: duration
          };
      };

      var _transform = _prefixStyle('transform');

      me.extend(me, {
          hasTransform: _transform !== false,
          hasPerspective: _prefixStyle('perspective') in _elementStyle,
          hasTouch: 'ontouchstart' in window,
          hasPointer: !!(window.PointerEvent || window.MSPointerEvent), // IE10 is prefixed
          hasTransition: _prefixStyle('transition') in _elementStyle
      });

      /*
      This should find all Android browsers lower than build 535.19 (both stock browser and webview)
      - galaxy S2 is ok
      - 2.3.6 : `AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1`
      - 4.0.4 : `AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30`
     - galaxy S3 is badAndroid (stock brower, webview)
       `AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30`
     - galaxy S4 is badAndroid (stock brower, webview)
       `AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30`
     - galaxy S5 is OK
       `AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Mobile Safari/537.36 (Chrome/)`
     - galaxy S6 is OK
       `AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Mobile Safari/537.36 (Chrome/)`
    */
      me.isBadAndroid = (function() {
          var appVersion = window.navigator.appVersion;
          // Android browser is not a chrome browser.
          if (/Android/.test(appVersion) && !(/Chrome\/\d/.test(appVersion))) {
              var safariVersion = appVersion.match(/Safari\/(\d+.\d)/);
              if(safariVersion && typeof safariVersion === "object" && safariVersion.length >= 2) {
                  return parseFloat(safariVersion[1]) < 535.19;
              } else {
                  return true;
              }
          } else {
              return false;
          }
      })();

      me.extend(me.style = {}, {
          transform: _transform,
          transitionTimingFunction: _prefixStyle('transitionTimingFunction'),
          transitionDuration: _prefixStyle('transitionDuration'),
          transitionDelay: _prefixStyle('transitionDelay'),
          transformOrigin: _prefixStyle('transformOrigin')
      });

      me.hasClass = function (e, c) {
          var re = new RegExp("(^|\\s)" + c + "(\\s|$)");
          return re.test(e.className);
      };

      me.addClass = function (e, c) {
          if ( me.hasClass(e, c) ) {
              return;
          }

          var newclass = e.className.split(' ');
          newclass.push(c);
          e.className = newclass.join(' ');
      };

      me.removeClass = function (e, c) {
          if ( !me.hasClass(e, c) ) {
              return;
          }

          var re = new RegExp("(^|\\s)" + c + "(\\s|$)", 'g');
          e.className = e.className.replace(re, ' ');
      };

      me.offset = function (el) {
          var left = -el.offsetLeft,
              top = -el.offsetTop;

          // jshint -W084
          while (el = el.offsetParent) {
              left -= el.offsetLeft;
              top -= el.offsetTop;
          }
          // jshint +W084

          return {
              left: left,
              top: top
          };
      };

      me.preventDefaultException = function (el, exceptions) {
          for ( var i in exceptions ) {
              if ( exceptions[i].test(el[i]) ) {
                  return true;
              }
          }

          return false;
      };

      me.extend(me.eventType = {}, {
          touchstart: 1,
          touchmove: 1,
          touchend: 1,

          mousedown: 2,
          mousemove: 2,
          mouseup: 2,

          pointerdown: 3,
          pointermove: 3,
          pointerup: 3,

          MSPointerDown: 3,
          MSPointerMove: 3,
          MSPointerUp: 3
      });

      me.extend(me.ease = {}, {
          quadratic: {
              style: 'cubic-bezier(0.25, 0.46, 0.45, 0.94)',
              fn: function (k) {
                  return k * ( 2 - k );
              }
          },
          circular: {
              style: 'cubic-bezier(0.1, 0.57, 0.1, 1)',   // Not properly "circular" but this looks better, it should be (0.075, 0.82, 0.165, 1)
              fn: function (k) {
                  return Math.sqrt( 1 - ( --k * k ) );
              }
          },
          back: {
              style: 'cubic-bezier(0.175, 0.885, 0.32, 1.275)',
              fn: function (k) {
                  var b = 4;
                  return ( k = k - 1 ) * k * ( ( b + 1 ) * k + b ) + 1;
              }
          },
          bounce: {
              style: '',
              fn: function (k) {
                  if ( ( k /= 1 ) < ( 1 / 2.75 ) ) {
                      return 7.5625 * k * k;
                  } else if ( k < ( 2 / 2.75 ) ) {
                      return 7.5625 * ( k -= ( 1.5 / 2.75 ) ) * k + 0.75;
                  } else if ( k < ( 2.5 / 2.75 ) ) {
                      return 7.5625 * ( k -= ( 2.25 / 2.75 ) ) * k + 0.9375;
                  } else {
                      return 7.5625 * ( k -= ( 2.625 / 2.75 ) ) * k + 0.984375;
                  }
              }
          },
          elastic: {
              style: '',
              fn: function (k) {
                  var f = 0.22,
                      e = 0.4;

                  if ( k === 0 ) { return 0; }
                  if ( k == 1 ) { return 1; }

                  return ( e * Math.pow( 2, - 10 * k ) * Math.sin( ( k - f / 4 ) * ( 2 * Math.PI ) / f ) + 1 );
              }
          }
      });

      me.tap = function (e, eventName) {
          var ev = document.createEvent('Event');
          ev.initEvent(eventName, true, true);
          ev.pageX = e.pageX;
          ev.pageY = e.pageY;
          e.target.dispatchEvent(ev);
      };

      me.click = function (e) {
          var target = e.target,
              ev;

          if ( !(/(SELECT|INPUT|TEXTAREA)/i).test(target.tagName) ) {
              // https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/initMouseEvent
              // initMouseEvent is deprecated.
              ev = document.createEvent(window.MouseEvent ? 'MouseEvents' : 'Event');
              ev.initEvent('click', true, true);
              ev.view = e.view || window;
              ev.detail = 1;
              ev.screenX = target.screenX || 0;
              ev.screenY = target.screenY || 0;
              ev.clientX = target.clientX || 0;
              ev.clientY = target.clientY || 0;
              ev.ctrlKey = !!e.ctrlKey;
              ev.altKey = !!e.altKey;
              ev.shiftKey = !!e.shiftKey;
              ev.metaKey = !!e.metaKey;
              ev.button = 0;
              ev.relatedTarget = null;
              ev._constructed = true;
              target.dispatchEvent(ev);
          }
      };

      return me;
  })();
  function IScrollForIosSelect (el, options) {
      this.wrapper = typeof el == 'string' ? document.querySelector(el) : el;
      this.scroller = this.wrapper.children[0];
      this.scrollerStyle = this.scroller.style;       // cache style for better performance

      this.options = {
          disablePointer: true,
          disableTouch: !utils.hasTouch,
          disableMouse: utils.hasTouch,
          startX: 0,
          startY: 0,
          scrollY: true,
          directionLockThreshold: 5,
          momentum: true,

          bounce: true,
          bounceTime: 600,
          bounceEasing: '',

          preventDefault: true,
          preventDefaultException: { tagName: /^(INPUT|TEXTAREA|BUTTON|SELECT)$/ },

          HWCompositing: true,
          useTransition: true,
          useTransform: true,
          bindToWrapper: typeof window.onmousedown === "undefined"
      };

      for ( var i in options ) {
          this.options[i] = options[i];
      }

      // Normalize options
      this.translateZ = this.options.HWCompositing && utils.hasPerspective ? ' translateZ(0)' : '';

      this.options.useTransition = utils.hasTransition && this.options.useTransition;
      this.options.useTransform = utils.hasTransform && this.options.useTransform;

      this.options.eventPassthrough = this.options.eventPassthrough === true ? 'vertical' : this.options.eventPassthrough;
      this.options.preventDefault = !this.options.eventPassthrough && this.options.preventDefault;

      // If you want eventPassthrough I have to lock one of the axes
      this.options.scrollY = this.options.eventPassthrough == 'vertical' ? false : this.options.scrollY;
      this.options.scrollX = this.options.eventPassthrough == 'horizontal' ? false : this.options.scrollX;

      // With eventPassthrough we also need lockDirection mechanism
      this.options.freeScroll = this.options.freeScroll && !this.options.eventPassthrough;
      this.options.directionLockThreshold = this.options.eventPassthrough ? 0 : this.options.directionLockThreshold;

      this.options.bounceEasing = typeof this.options.bounceEasing == 'string' ? utils.ease[this.options.bounceEasing] || utils.ease.circular : this.options.bounceEasing;

      this.options.resizePolling = this.options.resizePolling === undefined ? 60 : this.options.resizePolling;

      if ( this.options.tap === true ) {
          this.options.tap = 'tap';
      }

      // https://github.com/cubiq/iscrollForIosSelect/issues/1029
      if (!this.options.useTransition && !this.options.useTransform) {
          if(!(/relative|absolute/i).test(this.scrollerStyle.position)) {
              this.scrollerStyle.position = "relative";
          }
      }

      if ( this.options.shrinkScrollbars == 'scale' ) {
          this.options.useTransition = false;
      }

      this.options.invertWheelDirection = this.options.invertWheelDirection ? -1 : 1;

      if ( this.options.probeType == 3 ) {
          this.options.useTransition = false; }
      this.x = 0;
      this.y = 0;
      this.directionX = 0;
      this.directionY = 0;
      this._events = {};
      this._init();
      this.refresh();

      this.scrollTo(this.options.startX, this.options.startY);
      this.enable();
  }

  IScrollForIosSelect.prototype = {
      version: '1.0.0',

      _init: function () {
          this._initEvents();
      },

      destroy: function () {
          this._initEvents(true);
          clearTimeout(this.resizeTimeout);
          this.resizeTimeout = null;
          this._execEvent('destroy');
      },

      _transitionEnd: function (e) {
          if ( e.target != this.scroller || !this.isInTransition ) {
              return;
          }

          this._transitionTime();
          if ( !this.resetPosition(this.options.bounceTime) ) {
              this.isInTransition = false;
              this._execEvent('scrollEnd');
          }
      },

      _start: function (e) {
          // React to left mouse button only
          if ( utils.eventType[e.type] != 1 ) {
            // for button property
            // http://unixpapa.com/js/mouse.html
            var button;
          if (!e.which) {
            /* IE case */
            button = (e.button < 2) ? 0 :
                     ((e.button == 4) ? 1 : 2);
          } else {
            /* All others */
            button = e.button;
          }
              if ( button !== 0 ) {
                  return;
              }
          }

          if ( !this.enabled || (this.initiated && utils.eventType[e.type] !== this.initiated) ) {
              return;
          }

          if ( this.options.preventDefault && !utils.isBadAndroid && !utils.preventDefaultException(e.target, this.options.preventDefaultException) ) {
              e.preventDefault();
          }

          var point = e.touches ? e.touches[0] : e,
              pos;

          this.initiated  = utils.eventType[e.type];
          this.moved      = false;
          this.distX      = 0;
          this.distY      = 0;
          this.directionX = 0;
          this.directionY = 0;
          this.directionLocked = 0;

          this.startTime = utils.getTime();

          if ( this.options.useTransition && this.isInTransition ) {
              this._transitionTime();
              this.isInTransition = false;
              pos = this.getComputedPosition();
              this._translate(Math.round(pos.x), Math.round(pos.y));
              this._execEvent('scrollEnd');
          } else if ( !this.options.useTransition && this.isAnimating ) {
              this.isAnimating = false;
              this._execEvent('scrollEnd');
          }

          this.startX    = this.x;
          this.startY    = this.y;
          this.absStartX = this.x;
          this.absStartY = this.y;
          this.pointX    = point.pageX;
          this.pointY    = point.pageY;

          this._execEvent('beforeScrollStart');
      },

      _move: function (e) {
          if ( !this.enabled || utils.eventType[e.type] !== this.initiated ) {
              return;
          }

          if ( this.options.preventDefault ) {    // increases performance on Android? TODO: check!
              // e.preventDefault();
          }

          var point       = e.touches ? e.touches[0] : e,
              deltaX      = point.pageX - this.pointX,
              deltaY      = point.pageY - this.pointY,
              timestamp   = utils.getTime(),
              newX, newY,
              absDistX, absDistY;

          this.pointX     = point.pageX;
          this.pointY     = point.pageY;

          this.distX      += deltaX;
          this.distY      += deltaY;
          absDistX        = Math.abs(this.distX);
          absDistY        = Math.abs(this.distY);

          // We need to move at least 10 pixels for the scrolling to initiate
          if ( timestamp - this.endTime > 300 && (absDistX < 10 && absDistY < 10) ) {
              return;
          }

          // If you are scrolling in one direction lock the other
          if ( !this.directionLocked && !this.options.freeScroll ) {
              if ( absDistX > absDistY + this.options.directionLockThreshold ) {
                  this.directionLocked = 'h';     // lock horizontally
              } else if ( absDistY >= absDistX + this.options.directionLockThreshold ) {
                  this.directionLocked = 'v';     // lock vertically
              } else {
                  this.directionLocked = 'n';     // no lock
              }
          }

          if ( this.directionLocked == 'h' ) {
              if ( this.options.eventPassthrough == 'vertical' ) {
                  e.preventDefault();
              } else if ( this.options.eventPassthrough == 'horizontal' ) {
                  this.initiated = false;
                  return;
              }

              deltaY = 0;
          } else if ( this.directionLocked == 'v' ) {
              if ( this.options.eventPassthrough == 'horizontal' ) {
                  e.preventDefault();
              } else if ( this.options.eventPassthrough == 'vertical' ) {
                  this.initiated = false;
                  return;
              }

              deltaX = 0;
          }

          deltaX = this.hasHorizontalScroll ? deltaX : 0;
          deltaY = this.hasVerticalScroll ? deltaY : 0;

          newX = this.x + deltaX;
          newY = this.y + deltaY;

          // Slow down if outside of the boundaries
          if ( newX > 0 || newX < this.maxScrollX ) {
              newX = this.options.bounce ? this.x + deltaX / 3 : newX > 0 ? 0 : this.maxScrollX;
          }
          if ( newY > 0 || newY < this.maxScrollY ) {
              newY = this.options.bounce ? this.y + deltaY / 3 : newY > 0 ? 0 : this.maxScrollY;
          }

          this.directionX = deltaX > 0 ? -1 : deltaX < 0 ? 1 : 0;
          this.directionY = deltaY > 0 ? -1 : deltaY < 0 ? 1 : 0;

          if ( !this.moved ) {
              this._execEvent('scrollStart');
          }

          this.moved = true;

          this._translate(newX, newY);
          if ( timestamp - this.startTime > 300 ) {
              this.startTime = timestamp;
              this.startX = this.x;
              this.startY = this.y;

              if ( this.options.probeType == 1 ) {
                  this._execEvent('scroll');
              }
          }

          if ( this.options.probeType > 1 ) {
              this._execEvent('scroll');
          }

      },

      _end: function (e) {
          if ( !this.enabled || utils.eventType[e.type] !== this.initiated ) {
              return;
          }

          if ( this.options.preventDefault && !utils.preventDefaultException(e.target, this.options.preventDefaultException) ) {
              e.preventDefault();
          }

          var point = e.changedTouches ? e.changedTouches[0] : e,
              momentumX,
              momentumY,
              duration = utils.getTime() - this.startTime,
              newX = Math.round(this.x),
              newY = Math.round(this.y),
              distanceX = Math.abs(newX - this.startX),
              distanceY = Math.abs(newY - this.startY),
              time = 0,
              easing = '';

          this.isInTransition = 0;
          this.initiated = 0;
          this.endTime = utils.getTime();

          // reset if we are outside of the boundaries
          if ( this.resetPosition(this.options.bounceTime) ) {
              return;
          }

          this.scrollTo(newX, newY);  // ensures that the last position is rounded

          // we scrolled less than 10 pixels
          if ( !this.moved ) {
              if ( this.options.tap ) {
                  utils.tap(e, this.options.tap);
              }

              if ( this.options.click ) {
                  utils.click(e);
              }

              this._execEvent('scrollCancel');
              return;
          }

          if ( this._events.flick && duration < 200 && distanceX < 100 && distanceY < 100 ) {
              this._execEvent('flick');
              return;
          }

          // start momentum animation if needed
          if ( this.options.momentum && duration < 300 ) {
              momentumX = this.hasHorizontalScroll ? utils.momentum(this.x, this.startX, duration, this.maxScrollX, this.options.bounce ? this.wrapperWidth : 0, this.options.deceleration) : { destination: newX, duration: 0 };
              momentumY = this.hasVerticalScroll ? utils.momentum(this.y, this.startY, duration, this.maxScrollY, this.options.bounce ? this.wrapperHeight : 0, this.options.deceleration) : { destination: newY, duration: 0 };
              newX = momentumX.destination;
              newY = momentumY.destination;
              time = Math.max(momentumX.duration, momentumY.duration);
              this.isInTransition = 1;
          }


          if ( this.options.snap ) {
              var snap = this._nearestSnap(newX, newY);
              this.currentPage = snap;
              time = this.options.snapSpeed || Math.max(
                      Math.max(
                          Math.min(Math.abs(newX - snap.x), 1000),
                          Math.min(Math.abs(newY - snap.y), 1000)
                      ), 300);
              newX = snap.x;
              newY = snap.y;

              this.directionX = 0;
              this.directionY = 0;
              easing = this.options.bounceEasing;
          }


          if ( newX != this.x || newY != this.y ) {
              // change easing function when scroller goes out of the boundaries
              if ( newX > 0 || newX < this.maxScrollX || newY > 0 || newY < this.maxScrollY ) {
                  easing = utils.ease.quadratic;
              }

              this.scrollTo(newX, newY, time, easing);
              return;
          }

          this._execEvent('scrollEnd');
      },

      _resize: function () {
          var that = this;

          clearTimeout(this.resizeTimeout);

          this.resizeTimeout = setTimeout(function () {
              that.refresh();
          }, this.options.resizePolling);
      },

      resetPosition: function (time) {
          var x = this.x,
              y = this.y;

          time = time || 0;

          if ( !this.hasHorizontalScroll || this.x > 0 ) {
              x = 0;
          } else if ( this.x < this.maxScrollX ) {
              x = this.maxScrollX;
          }

          if ( !this.hasVerticalScroll || this.y > 0 ) {
              y = 0;
          } else if ( this.y < this.maxScrollY ) {
              y = this.maxScrollY;
          }

          if ( x == this.x && y == this.y ) {
              return false;
          }

          this.scrollTo(x, y, time, this.options.bounceEasing);

          return true;
      },

      disable: function () {
          this.enabled = false;
      },

      enable: function () {
          this.enabled = true;
      },

      refresh: function () {
          var rf = this.wrapper.offsetHeight;     // Force reflow

          this.wrapperWidth   = this.wrapper.clientWidth;
          this.wrapperHeight  = this.wrapper.clientHeight;


          this.scrollerWidth  = this.scroller.offsetWidth;
          this.scrollerHeight = this.scroller.offsetHeight;

          this.maxScrollX     = this.wrapperWidth - this.scrollerWidth;
          this.maxScrollY     = this.wrapperHeight - this.scrollerHeight;


          this.hasHorizontalScroll    = this.options.scrollX && this.maxScrollX < 0;
          this.hasVerticalScroll      = this.options.scrollY && this.maxScrollY < 0;

          if ( !this.hasHorizontalScroll ) {
              this.maxScrollX = 0;
              this.scrollerWidth = this.wrapperWidth;
          }

          if ( !this.hasVerticalScroll ) {
              this.maxScrollY = 0;
              this.scrollerHeight = this.wrapperHeight;
          }

          this.endTime = 0;
          this.directionX = 0;
          this.directionY = 0;

          this.wrapperOffset = utils.offset(this.wrapper);

          this._execEvent('refresh');

          this.resetPosition();


      },

      on: function (type, fn) {
          if ( !this._events[type] ) {
              this._events[type] = [];
          }

          this._events[type].push(fn);
      },

      off: function (type, fn) {
          if ( !this._events[type] ) {
              return;
          }

          var index = this._events[type].indexOf(fn);

          if ( index > -1 ) {
              this._events[type].splice(index, 1);
          }
      },

      _execEvent: function (type) {
          if ( !this._events[type] ) {
              return;
          }

          var i = 0,
              l = this._events[type].length;

          if ( !l ) {
              return;
          }

          for ( ; i < l; i++ ) {
              this._events[type][i].apply(this, [].slice.call(arguments, 1));
          }
      },

      scrollTo: function (x, y, time, easing) {
          easing = easing || utils.ease.circular;

          this.isInTransition = this.options.useTransition && time > 0;
          var transitionType = this.options.useTransition && easing.style;
          if ( !time || transitionType ) {
                  if(transitionType) {
                      this._transitionTimingFunction(easing.style);
                      this._transitionTime(time);
                  }
              this._translate(x, y);
          } else {
              this._animate(x, y, time, easing.fn);
          }
      },

      scrollToElement: function (el, time, offsetX, offsetY, easing) {
          el = el.nodeType ? el : this.scroller.querySelector(el);

          if ( !el ) {
              return;
          }

          var pos = utils.offset(el);

          pos.left -= this.wrapperOffset.left;
          pos.top  -= this.wrapperOffset.top;

          // if offsetX/Y are true we center the element to the screen
          if ( offsetX === true ) {
              offsetX = Math.round(el.offsetWidth / 2 - this.wrapper.offsetWidth / 2);
          }
          if ( offsetY === true ) {
              offsetY = Math.round(el.offsetHeight / 2 - this.wrapper.offsetHeight / 2);
          }

          pos.left -= offsetX || 0;
          pos.top  -= offsetY || 0;

          pos.left = pos.left > 0 ? 0 : pos.left < this.maxScrollX ? this.maxScrollX : pos.left;
          pos.top  = pos.top  > 0 ? 0 : pos.top  < this.maxScrollY ? this.maxScrollY : pos.top;

          time = time === undefined || time === null || time === 'auto' ? Math.max(Math.abs(this.x-pos.left), Math.abs(this.y-pos.top)) : time;

          this.scrollTo(pos.left, pos.top, time, easing);
      },

      _transitionTime: function (time) {
          if (!this.options.useTransition) {
              return;
          }
          time = time || 0;
          var durationProp = utils.style.transitionDuration;
          if(!durationProp) {
              return;
          }

          this.scrollerStyle[durationProp] = time + 'ms';

          if ( !time && utils.isBadAndroid ) {
              this.scrollerStyle[durationProp] = '0.0001ms';
              // remove 0.0001ms
              var self = this;
              rAF(function() {
                  if(self.scrollerStyle[durationProp] === '0.0001ms') {
                      self.scrollerStyle[durationProp] = '0s';
                  }
              });
          }



      },

      _transitionTimingFunction: function (easing) {
          this.scrollerStyle[utils.style.transitionTimingFunction] = easing;



      },

      _translate: function (x, y) {
          if ( this.options.useTransform ) {


              this.scrollerStyle[utils.style.transform] = 'translate(' + x + 'px,' + y + 'px)' + this.translateZ;


          } else {
              x = Math.round(x);
              y = Math.round(y);
              this.scrollerStyle.left = x + 'px';
              this.scrollerStyle.top = y + 'px';
          }

          this.x = x;
          this.y = y;



      },

      _initEvents: function (remove) {
          var eventType = remove ? utils.removeEvent : utils.addEvent,
              target = this.options.bindToWrapper ? this.wrapper : window;

          eventType(window, 'orientationchange', this);
          eventType(window, 'resize', this);

          if ( this.options.click ) {
              eventType(this.wrapper, 'click', this, true);
          }

          if ( !this.options.disableMouse ) {
              eventType(this.wrapper, 'mousedown', this);
              eventType(target, 'mousemove', this);
              eventType(target, 'mousecancel', this);
              eventType(target, 'mouseup', this);
          }

          if ( utils.hasPointer && !this.options.disablePointer ) {
              eventType(this.wrapper, utils.prefixPointerEvent('pointerdown'), this);
              eventType(target, utils.prefixPointerEvent('pointermove'), this);
              eventType(target, utils.prefixPointerEvent('pointercancel'), this);
              eventType(target, utils.prefixPointerEvent('pointerup'), this);
          }

          if ( utils.hasTouch && !this.options.disableTouch ) {
              eventType(this.wrapper, 'touchstart', this);
              eventType(target, 'touchmove', this);
              eventType(target, 'touchcancel', this);
              eventType(target, 'touchend', this);
          }

          eventType(this.scroller, 'transitionend', this);
          eventType(this.scroller, 'webkitTransitionEnd', this);
          eventType(this.scroller, 'oTransitionEnd', this);
          eventType(this.scroller, 'MSTransitionEnd', this);
      },

      getComputedPosition: function () {
          var matrix = window.getComputedStyle(this.scroller, null),
              x, y;

          if ( this.options.useTransform ) {
              matrix = matrix[utils.style.transform].split(')')[0].split(', ');
              x = +(matrix[12] || matrix[4]);
              y = +(matrix[13] || matrix[5]);
          } else {
              x = +matrix.left.replace(/[^-\d.]/g, '');
              y = +matrix.top.replace(/[^-\d.]/g, '');
          }

          return { x: x, y: y };
      },

      _animate: function (destX, destY, duration, easingFn) {
          var that = this,
              startX = this.x,
              startY = this.y,
              startTime = utils.getTime(),
              destTime = startTime + duration;

          function step () {
              var now = utils.getTime(),
                  newX, newY,
                  easing;

              if ( now >= destTime ) {
                  that.isAnimating = false;
                  that._translate(destX, destY);
                  
                  if ( !that.resetPosition(that.options.bounceTime) ) {
                      that._execEvent('scrollEnd');
                  }

                  return;
              }

              now = ( now - startTime ) / duration;
              easing = easingFn(now);
              newX = ( destX - startX ) * easing + startX;
              newY = ( destY - startY ) * easing + startY;
              that._translate(newX, newY);

              if ( that.isAnimating ) {
                  rAF(step);
              }

              if ( that.options.probeType == 3 ) {
                  that._execEvent('scroll');
              }
          }

          this.isAnimating = true;
          step();
      },

      handleEvent: function (e) {
          switch ( e.type ) {
              case 'touchstart':
              case 'pointerdown':
              case 'MSPointerDown':
              case 'mousedown':
                  this._start(e);
                  break;
              case 'touchmove':
              case 'pointermove':
              case 'MSPointerMove':
              case 'mousemove':
                  this._move(e);
                  break;
              case 'touchend':
              case 'pointerup':
              case 'MSPointerUp':
              case 'mouseup':
              case 'touchcancel':
              case 'pointercancel':
              case 'MSPointerCancel':
              case 'mousecancel':
                  this._end(e);
                  break;
              case 'orientationchange':
              case 'resize':
                  this._resize();
                  break;
              case 'transitionend':
              case 'webkitTransitionEnd':
              case 'oTransitionEnd':
              case 'MSTransitionEnd':
                  this._transitionEnd(e);
                  break;
              case 'click':
                  if ( this.enabled && !e._constructed ) {
                      e.preventDefault();
                      e.stopPropagation();
                  }
                  break;
          }
      }
  };
  IScrollForIosSelect.utils = utils;

  var iosSelectUtil = {
    isArray: function (arg1) {
      return Object.prototype.toString.call(arg1) === '[object Array]';
    },
    isFunction: function (arg1) {
      return typeof arg1 === 'function';
    },
    attrToData: function (dom, index) {
      var obj = {};
      for (var p in dom.dataset) {
        obj[p] = dom.dataset[p];
      }
      obj['dom'] = dom;
      obj['atindex'] = index;
      return obj;
    },
    attrToHtml: function (obj) {
      var html = '';
      for (var p in obj) {
        html += 'data-' + p + '="' + obj[p] + '"';
      }
      return html;
    }
  };
  /*function preventEventFun(e) {
    e.preventDefault();
  }*/
  // Layer
  function Layer(html, opts) {
    if (!(this instanceof Layer)) {
      return new Layer(html, opts);
    }
    this.html = html;
    this.opts = opts;
    var el = document.createElement('div');
    el.className = 'olay';
    var layer_el = document.createElement('div');
    layer_el.className = 'layer';
    this.el = el;
    this.layer_el = layer_el;
    this.init();
  }
  Layer.prototype = {
    init: function () {
      this.layer_el.innerHTML = this.html;
      if (this.opts.container && document.querySelector(this.opts.container)) {
        document.querySelector(this.opts.container).appendChild(this.el);
      }
      else {
        document.body.appendChild(this.el);
      }
      this.el.appendChild(this.layer_el);
      this.el.style.height = Math.max(document.documentElement.getBoundingClientRect().height, window.innerHeight);
      if (this.opts.className) {
        this.el.className += ' ' + this.opts.className;
      }
      this.bindEvent();
    },
    bindEvent: function () {
      var sureDom = this.el.querySelectorAll('.sure');
      var closeDom = this.el.querySelectorAll('.close');
      var self = this;
      this.el.addEventListener('click', function(e) {
        self.close();
        self.opts.maskCallback && self.opts.maskCallback();
      });
      this.layer_el.addEventListener('click', function(e) {
        e.stopPropagation();
      });
      Array.prototype.slice.call(sureDom).forEach(function (item, index) {
        item.addEventListener('click', function () {
          self.close();
        });
      });
      Array.prototype.slice.call(closeDom).forEach(function (item, index) {
        item.addEventListener('click', function () {
          self.close();
          self.opts.fallback && self.opts.fallback();
        });
      });
    },
    close: function () {
      var self=this;
      if (self.el) {
        if (self.opts.showAnimate) {
          self.el.className += ' fadeOutDown';
          self.el.addEventListener(aF, function () {
            self.removeDom();
          });
        }
        else {
          self.removeDom();
        }
      }
    },
    removeDom: function (){
      this.el.parentNode.removeChild(this.el);
      this.el = null;
      if (document.documentElement.classList.contains('ios-select-body-class')) {
        document.documentElement.classList.remove('ios-select-body-class');
        /*document.body.removeEventListener('touchmove', preventEventFun, {
          passive: false
        });*/
      }
    }
  }
  function IosSelect(level, data, options) {
    if (!iosSelectUtil.isArray(data) || data.length === 0) {
      throw new TypeError('the data must be a non-empty array!');
      return;
    }
    if ([1, 2, 3, 4, 5, 6].indexOf(level) == -1) {
      throw new RangeError('the level parameter must be one of 1,2,3,4,5,6!');
      return;
    }
    this.data = data;
    this.level = level || 1;
    this.options = options;
    this.typeBox = 'one-level-box';
    var boxClass = ['one', 'two', 'three', 'four', 'five', 'six'];
    if (this.level <= 6 && this.level >= 1) {
      this.typeBox = boxClass[parseInt(this.level) - 1] + '-level-box';
    }
    this.title = options.title || '';
    this.options.itemHeight = options.itemHeight || 35;
    this.options.itemShowCount = [3, 5, 7, 9].indexOf(options.itemShowCount) !== -1? options.itemShowCount: 7; 
    this.options.coverArea1Top = Math.floor(this.options.itemShowCount / 2);
    this.options.coverArea2Top = Math.ceil(this.options.itemShowCount / 2); 
    this.options.headerHeight = options.headerHeight || 44;
    this.options.relation = iosSelectUtil.isArray(this.options.relation)? this.options.relation: [];
    this.options.oneTwoRelation = this.options.relation[0];
    this.options.twoThreeRelation = this.options.relation[1];
    this.options.threeFourRelation = this.options.relation[2];
    this.options.fourFiveRelation = this.options.relation[3];
    this.options.fiveSixRelation = this.options.relation[4];
    if (this.options.cssUnit !== 'px' && this.options.cssUnit !== 'rem') {
      this.options.cssUnit = 'px';
    }
    var self = this;
    // 选中元素的信息
    this.selectOneObj = {
      id: self.options.oneLevelId
    };
    this.selectTwoObj = {
      id: self.options.twoLevelId
    };
    this.selectThreeObj = {
      id: self.options.threeLevelId
    };
    this.selectFourObj = {
      id: self.options.fourLevelId
    };
    this.selectFiveObj = {
      id: self.options.fiveLevelId
    };
    this.selectSixObj = {
      id: self.options.sixLevelId
    };
    this.setBase();
    this.init();
  };

  IosSelect.prototype = {
    init: function () {
      this.initLayer();
      this.setLevelData(1, this.options.oneLevelId, this.options.twoLevelId, this.options.threeLevelId, this.options.fourLevelId, this.options.fiveLevelId, this.options.sixLevelId);
    },
    initLayer: function () {
      var self = this;
      var sureText = this.options.sureText || '确定';
      var closeText = this.options.closeText || '取消';
      var headerHeightCss = this.options.headerHeight + this.options.cssUnit;
      var all_html = [
        '<header style="height: ' + headerHeightCss + '; line-height: ' + headerHeightCss + '" class="iosselect-header">',
          '<a style="height: ' + headerHeightCss + '; line-height: ' + headerHeightCss + '" href="javascript:void(0)" class="close">' + closeText + '</a>',
          '<h2 id="iosSelectTitle"></h2>',
          '<a style="height: ' + headerHeightCss + '; line-height: ' + headerHeightCss + '" href="javascript:void(0)" class="sure">' + sureText + '</a>',
        '</header>',
        '<section class="iosselect-box">',
          '<div class="one-level-contain" id="oneLevelContain">',
            '<ul class="select-one-level">',
            '</ul>',
          '</div>',
          '<div class="two-level-contain" id="twoLevelContain">',
            '<ul class="select-two-level">',
            '</ul>',
          '</div>',
          '<div class="three-level-contain" id="threeLevelContain">',
            '<ul class="select-three-level">',
            '</ul>',
          '</div>',
          '<div class="four-level-contain" id="fourLevelContain">',
            '<ul class="select-four-level">',
            '</ul>',
          '</div>',
          '<div class="five-level-contain" id="fiveLevelContain">',
            '<ul class="select-five-level">',
            '</ul>',
          '</div>',
          '<div class="six-level-contain" id="sixLevelContain">',
            '<ul class="select-six-level">',
            '</ul>',
          '</div>',
        '</section>',
        '<hr class="cover-area1"/>',
        '<hr class="cover-area2"/>',
        '<div class="ios-select-loading-box" id="iosSelectLoadingBox">',
            '<div class="ios-select-loading"></div>',
        '</div>'
      ].join('\r\n');
      this.iosSelectLayer = new Layer(all_html, {
        className: 'ios-select-widget-box ' + this.typeBox + (this.options.addClassName? ' ' + this.options.addClassName: '') + (this.options.showAnimate? ' fadeInUp': ''),
        container: this.options.container || '',
        showAnimate: this.options.showAnimate,
        fallback: this.options.fallback,
        maskCallback: this.options.maskCallback
      });

      this.iosSelectTitleDom = this.iosSelectLayer.el.querySelector('#iosSelectTitle');
      this.iosSelectLoadingBoxDom = this.iosSelectLayer.el.querySelector('#iosSelectLoadingBox');
      this.iosSelectTitleDom.innerHTML = this.title;
      if (this.options.headerHeight && this.options.itemHeight) {
        this.coverArea1Dom = this.iosSelectLayer.el.querySelector('.cover-area1');
        this.coverArea1Dom.style.top = this.options.headerHeight + this.options.itemHeight * this.options.coverArea1Top + this.options.cssUnit;
        this.coverArea2Dom = this.iosSelectLayer.el.querySelector('.cover-area2');
        this.coverArea2Dom.style.top = this.options.headerHeight + this.options.itemHeight * this.options.coverArea2Top + this.options.cssUnit;
      }

      this.oneLevelContainDom = this.iosSelectLayer.el.querySelector('#oneLevelContain');
      this.twoLevelContainDom = this.iosSelectLayer.el.querySelector('#twoLevelContain');
      this.threeLevelContainDom = this.iosSelectLayer.el.querySelector('#threeLevelContain');
      this.fourLevelContainDom = this.iosSelectLayer.el.querySelector('#fourLevelContain');
      this.fiveLevelContainDom = this.iosSelectLayer.el.querySelector('#fiveLevelContain');
      this.sixLevelContainDom = this.iosSelectLayer.el.querySelector('#sixLevelContain');

      this.oneLevelUlContainDom = this.iosSelectLayer.el.querySelector('.select-one-level');
      this.twoLevelUlContainDom = this.iosSelectLayer.el.querySelector('.select-two-level');
      this.threeLevelUlContainDom = this.iosSelectLayer.el.querySelector('.select-three-level');
      this.fourLevelUlContainDom = this.iosSelectLayer.el.querySelector('.select-four-level');
      this.fiveLevelUlContainDom = this.iosSelectLayer.el.querySelector('.select-five-level');
      this.sixLevelUlContainDom = this.iosSelectLayer.el.querySelector('.select-six-level');

      this.iosSelectLayer.el.querySelector('.layer').style.height = this.options.itemHeight * this.options.itemShowCount + this.options.headerHeight + this.options.cssUnit;

      this.oneLevelContainDom.style.height = this.options.itemHeight * this.options.itemShowCount + this.options.cssUnit;
      document.documentElement.classList.add('ios-select-body-class');
      /*document.body.addEventListener('touchmove', preventEventFun, {
        passive: false
      });*/

      this.scrollOne = new IScrollForIosSelect('#oneLevelContain', {
        probeType: 3,
        bounce: false
      });
      this.setScorllEvent(this.scrollOne, 1);
      
      if (this.level >= 2) {
        this.twoLevelContainDom.style.height = this.options.itemHeight * this.options.itemShowCount + this.options.cssUnit;
        this.scrollTwo = new IScrollForIosSelect('#twoLevelContain', {
          probeType: 3,
          bounce: false
        });
        this.setScorllEvent(this.scrollTwo, 2);
      }
      if (this.level >= 3) {
        this.threeLevelContainDom.style.height = this.options.itemHeight * this.options.itemShowCount + this.options.cssUnit;
        this.scrollThree = new IScrollForIosSelect('#threeLevelContain', {
          probeType: 3,
          bounce: false
        });
        this.setScorllEvent(this.scrollThree, 3);
      }
      if (this.level >= 4) {
        this.fourLevelContainDom.style.height = this.options.itemHeight * this.options.itemShowCount + this.options.cssUnit;
        this.scrollFour = new IScrollForIosSelect('#fourLevelContain', {
          probeType: 3,
          bounce: false
        });
        this.setScorllEvent(this.scrollFour, 4);
      }
      if (this.level >= 5) {
        this.fiveLevelContainDom.style.height = this.options.itemHeight * this.options.itemShowCount + this.options.cssUnit;
        this.scrollFive = new IScrollForIosSelect('#fiveLevelContain', {
          probeType: 3,
          bounce: false
        });
        this.setScorllEvent(this.scrollFive, 5);
      }
      if (this.level >= 6) {
        this.sixLevelContainDom.style.height = this.options.itemHeight * this.options.itemShowCount + this.options.cssUnit;
        this.scrollSix = new IScrollForIosSelect('#sixLevelContain', {
          probeType: 3,
          bounce: false
        });
        this.setScorllEvent(this.scrollSix, 6);
      }

      // 确认
      this.selectBtnDom = this.iosSelectLayer.el.querySelector('.sure');
      this.selectBtnDom.addEventListener('click', function (e) {
        self.options.callback && self.options.callback(self.selectOneObj, self.selectTwoObj, self.selectThreeObj, self.selectFourObj, self.selectFiveObj, self.selectSixObj);
      });
    },
    mapKeyByIndex: function (index) {
      var self = this;
      var map = {
        index: 1,
        levelContain: self.oneLevelContainDom,
        relation: self.options.oneTwoRelation
      };
      if (index === 2) {
        map = {
          index: 2,
          levelContain: self.twoLevelContainDom,
          relation: self.options.twoThreeRelation
        };
      }
      else if (index === 3) {
        map = {
          index: 3,
          levelContain: self.threeLevelContainDom,
          relation: self.options.threeFourRelation
        };
      }
      else if (index === 4) {
        map = {
          index: 4,
          levelContain: self.fourLevelContainDom,
          relation: self.options.fourFiveRelation
        };
      }
      else if (index === 5) {
        map = {
          index: 5,
          levelContain: self.fiveLevelContainDom,
          relation: self.options.fiveSixRelation
        };
      }
      else if (index === 6) {
        map = {
          index: 6,
          levelContain: self.sixLevelContainDom,
          relation: 0
        };
      }
      return map;
    },
    setScorllEvent: function (scrollInstance, index) {
      var self = this;
      var mapKey = self.mapKeyByIndex(index);
      scrollInstance.on('scrollStart', function () {
        self.toggleClassList(mapKey.levelContain);
      });
      scrollInstance.on('scroll', function () {
        if (isNaN(this.y)) {
          return;
        }
        var pa = Math.abs(this.y / self.baseSize) / self.options.itemHeight;
        var plast = 1;
        plast = Math.round(pa) + 1;
        self.toggleClassList(mapKey.levelContain);
        self.changeClassName(mapKey.levelContain, plast);
      });
      scrollInstance.on('scrollEnd', function () {
        var pa = Math.abs(this.y / self.baseSize) / self.options.itemHeight;
        var plast = 1;
        var to = 0;
        if (Math.ceil(pa) === Math.round(pa)) {
          to = Math.ceil(pa) * self.options.itemHeight * self.baseSize;
          plast = Math.ceil(pa) + 1;
        } else {
          to = Math.floor(pa) * self.options.itemHeight * self.baseSize;
          plast = Math.floor(pa) + 1;
        }
        scrollInstance.scrollTo(0, -to, 0);

        self.toggleClassList(mapKey.levelContain);

        var pdom = self.changeClassName(mapKey.levelContain, plast);
        var obj = iosSelectUtil.attrToData(pdom, plast);
        self.setSelectObj(index, obj);

        if (self.level > index) {
          if ((mapKey.relation === 1 && iosSelectUtil.isArray(self.data[index])) || iosSelectUtil.isFunction(self.data[index])) {
            self.setLevelData(index + 1, self.selectOneObj.id, self.selectTwoObj.id, self.selectThreeObj.id, self.selectFourObj.id, self.selectFiveObj.id, self.selectSixObj.id);
          }
        }
      });
            scrollInstance.on('scrollCancel', function () {
        var pa = Math.abs(this.y / self.baseSize) / self.options.itemHeight;
        var plast = 1;
        var to = 0;
        if (Math.ceil(pa) === Math.round(pa)) {
          to = Math.ceil(pa) * self.options.itemHeight * self.baseSize;
          plast = Math.ceil(pa) + 1;
        } else {
          to = Math.floor(pa) * self.options.itemHeight * self.baseSize;
          plast = Math.floor(pa) + 1;
        }
        scrollInstance.scrollTo(0, -to, 0);

        self.toggleClassList(mapKey.levelContain);

        var pdom = self.changeClassName(mapKey.levelContain, plast);
        var obj = iosSelectUtil.attrToData(pdom, plast);
        self.setSelectObj(index, obj);

        if (self.level > index) {
          if ((mapKey.relation === 1 && iosSelectUtil.isArray(self.data[index])) || iosSelectUtil.isFunction(self.data[index])) {
            self.setLevelData(index + 1, self.selectOneObj.id, self.selectTwoObj.id, self.selectThreeObj.id, self.selectFourObj.id, self.selectFiveObj.id, self.selectSixObj.id);
          }
          
        }
      });
    },
    loadingShow: function () {
      this.options.showLoading && (this.iosSelectLoadingBoxDom.style.display = 'block');
    },
    loadingHide: function () {
      this.iosSelectLoadingBoxDom.style.display = 'none';
    },
      mapRenderByIndex: function (index) {
      var self = this;
      var map = {
        index: 1,
        relation: 0,
        levelUlContainDom: self.oneLevelUlContainDom,
        scrollInstance: self.scrollOne, 
        levelContainDom: self.oneLevelContainDom
      };
      if (index === 2) {
        map = {
          index: 2,
          relation: self.options.oneTwoRelation,
          levelUlContainDom: self.twoLevelUlContainDom,
          scrollInstance: self.scrollTwo, 
          levelContainDom: self.twoLevelContainDom
        };
      }
      else if (index === 3) {
        map = {
          index: 3,
          relation: self.options.twoThreeRelation,
          levelUlContainDom: self.threeLevelUlContainDom,
          scrollInstance: self.scrollThree, 
          levelContainDom: self.threeLevelContainDom
        };
      }
      else if (index === 4) {
        map = {
          index: 4,
          relation: self.options.threeFourRelation,
          levelUlContainDom: self.fourLevelUlContainDom,
          scrollInstance: self.scrollFour, 
          levelContainDom: self.fourLevelContainDom
        };
      }
      else if (index === 5) {
        map = {
          index: 5,
          relation: self.options.fourFiveRelation,
          levelUlContainDom: self.fiveLevelUlContainDom,
          scrollInstance: self.scrollFive, 
          levelContainDom: self.fiveLevelContainDom
        };
      }
      else if (index === 6) {
        map = {
          index: 6,
          relation: self.options.fiveSixRelation,
          levelUlContainDom: self.sixLevelUlContainDom,
          scrollInstance: self.scrollSix, 
          levelContainDom: self.sixLevelContainDom
        };
      }
      return map;
    },
      getLevelData: function (index, oneLevelId, twoLevelId, threeLevelId, fourLevelId, fiveLevelId) {
      var levelData = [];
      var renderMap = this.mapRenderByIndex(index);
      if (index === 1) {
        levelData = this.data[0];
      }
      else if (renderMap.relation === 1) {
        var pid = arguments[index - 1];
        this.data[index - 1].forEach(function (v, i, o) {
          if (v['parentId'] == pid) {
            levelData.push(v);
          }
        });
      }
      else {
        levelData = this.data[index - 1];
      }
      return levelData;
    },
    setLevelData: function (index, oneLevelId, twoLevelId, threeLevelId, fourLevelId, fiveLevelId, sixLevelId) {
      if (iosSelectUtil.isArray(this.data[index - 1])) {
        var levelData = this.getLevelData(index, oneLevelId, twoLevelId, threeLevelId, fourLevelId);
        this.renderLevel(index, oneLevelId, twoLevelId, threeLevelId, fourLevelId, fiveLevelId, sixLevelId, levelData);
      }
      else if (iosSelectUtil.isFunction(this.data[index - 1])) {
        this.loadingShow();
        this.data[index - 1].apply(this, [oneLevelId, twoLevelId, threeLevelId, fourLevelId, fiveLevelId].slice(0, index - 1).concat(function (levelData) {
          this.loadingHide();
          this.renderLevel(index, oneLevelId, twoLevelId, threeLevelId, fourLevelId, fiveLevelId, sixLevelId, levelData);
        }.bind(this)));
      }
      else {
        throw new Error('data format error');
      }
    },
      renderLevel: function (index, oneLevelId, twoLevelId, threeLevelId, fourLevelId, fiveLevelId, sixLevelId, levelData) {
        var plast = 0;
        var curLevelId = arguments[index];
      var hasAtId = levelData.some(function (v, i, o) {
        return v.id == curLevelId;
      });
      if (!hasAtId) {
        curLevelId = levelData[0]['id'];
      }
      var tmpHtml = '';
      var itemHeightStyle = this.options.itemHeight + this.options.cssUnit;
      tmpHtml += this.getWhiteItem();
      levelData.forEach(function (v, i, o) {
        if (v.id == curLevelId) {
          tmpHtml += '<li style="height: ' + itemHeightStyle + '; line-height: ' + itemHeightStyle +';"' + iosSelectUtil.attrToHtml(v) + ' class="at">' + v.value + '</li>';
          plast = i + 1;
        }
        else {
          tmpHtml += '<li style="height: ' + itemHeightStyle + '; line-height: ' + itemHeightStyle +';"' + iosSelectUtil.attrToHtml(v) + '>' + v.value + '</li>';
        }
      });
      tmpHtml += this.getWhiteItem();
      var renderMap = this.mapRenderByIndex(index);
      renderMap.levelUlContainDom.innerHTML = tmpHtml;
      renderMap.scrollInstance.refresh();
      renderMap.scrollInstance.scrollToElement(':nth-child(' + plast + ')', 0);
      var pdom = this.changeClassName(renderMap.levelContainDom, plast);
      var obj = iosSelectUtil.attrToData(pdom, plast);
      this.setSelectObj(index, obj);
      if (this.level > index) {
        this.setLevelData(index + 1, this.selectOneObj.id, this.selectTwoObj.id, this.selectThreeObj.id, this.selectFourObj.id, this.selectFiveObj.id, this.selectSixObj.id);
      }
      },
      setSelectObj: function (index, obj) {
        if (index === 1) {
        this.selectOneObj = obj;
      }
      else if (index === 2) {
        this.selectTwoObj = obj;
      }
      else if (index === 3) {
        this.selectThreeObj = obj;
      }
      else if (index === 4) {
        this.selectFourObj = obj;
      }
      else if (index === 5) {
        this.selectFiveObj = obj;
      }
      else if (index === 6) {
        this.selectSixObj = obj;
      }
      },
      getWhiteItem: function () {
        var whiteItemHtml = '';
        var itemHeightStyle = this.options.itemHeight + this.options.cssUnit;
        var itemLi = '<li style="height: ' + itemHeightStyle +  '; line-height: ' + itemHeightStyle + '"></li>';
        whiteItemHtml += itemLi;
        if (this.options.itemShowCount > 3) {
          whiteItemHtml += itemLi;
        }
        if (this.options.itemShowCount > 5) {
          whiteItemHtml += itemLi;
        }
        if (this.options.itemShowCount > 7) {
          whiteItemHtml += itemLi;
        }
        return whiteItemHtml;
      }, 
      changeClassName: function (levelContainDom, plast) {
        var pdom;
        if (this.options.itemShowCount === 3) {
          pdom = levelContainDom.querySelector('li:nth-child(' + (plast + 1) + ')');
        pdom.classList.add('at');
        }
        else if (this.options.itemShowCount === 5) {
          pdom = levelContainDom.querySelector('li:nth-child(' + (plast + 2) + ')');
        pdom.classList.add('at');
        levelContainDom.querySelector('li:nth-child(' + (plast + 1) + ')').classList.add('side1');
        levelContainDom.querySelector('li:nth-child(' + (plast + 3) + ')').classList.add('side1');
        }
        else if (this.options.itemShowCount === 7) {
          pdom = levelContainDom.querySelector('li:nth-child(' + (plast + 3) + ')');
        pdom.classList.add('at');
        levelContainDom.querySelector('li:nth-child(' + (plast + 2) + ')').classList.add('side1');
        levelContainDom.querySelector('li:nth-child(' + (plast + 1) + ')').classList.add('side2');
        levelContainDom.querySelector('li:nth-child(' + (plast + 4) + ')').classList.add('side1');
        levelContainDom.querySelector('li:nth-child(' + (plast + 5) + ')').classList.add('side2');
        }
        else if (this.options.itemShowCount === 9) {
          pdom = levelContainDom.querySelector('li:nth-child(' + (plast + 4) + ')');
        pdom.classList.add('at');
        levelContainDom.querySelector('li:nth-child(' + (plast + 3) + ')').classList.add('side1');
        levelContainDom.querySelector('li:nth-child(' + (plast + 2) + ')').classList.add('side2');
        levelContainDom.querySelector('li:nth-child(' + (plast + 5) + ')').classList.add('side1');
        levelContainDom.querySelector('li:nth-child(' + (plast + 6) + ')').classList.add('side2');
        }
        return pdom;
      },
      setBase: function () {
      if (this.options.cssUnit === 'rem') {
        var dltDom = document.documentElement;
        var dltStyle = window.getComputedStyle(dltDom, null);
        var dltFontSize = dltStyle.fontSize;
        try {
          this.baseSize = /\d+(?:\.\d+)?/.exec(dltFontSize)[0];
        }
        catch(e) {
          this.baseSize = 1;
        }
      }
      else {
        this.baseSize = 1;
      }
    },
    toggleClassList: function (dom) {
      Array.prototype.slice.call(dom.querySelectorAll('li')).forEach(function (v) {
        if (v.classList.contains('at')) {
          v.classList.remove('at');
        }
        else if (v.classList.contains('side1')) {
          v.classList.remove('side1');
        }
        else if (v.classList.contains('side2')) {
          v.classList.remove('side2');
        }
      })
    }
  }
  if (typeof module != 'undefined' && module.exports) {
    module.exports = IosSelect;
  }
  else if (typeof define == 'function' && define.amd) {
    define(function () {
      return IosSelect;
    });
  }
  else {
    window.IosSelect = IosSelect;
  }
})();